514 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



Micropterus salmoides^ Ictiobus cyprinella^ I. hulbalus, Fairport, 

 Iowa; Dorosoma cepediarvmn, Promoxis cmnularis, Roccus chrysops, 

 yellow perch {P&rca flavescens), Little Star Lake, Wis.; Catostomus 

 commersonii, Shenandoah River, Strasburg, Va. ; Ameiurus nebulosits 

 in Lake Erie ; and on catfish in Lake Dallas, Tex. 



The remains of specimens of hiramosus in the U, S. National 

 Museum are identical in every respect with appendiculosus. 



ARGULUS LEPIDOSTEI Kellicott 

 FiGIXBE 44 



Argulus lepidostei Kellicott, 1877, p. 214, figs. 1, 2.— Wilson, 1902, p. 712, pi. 16 ; 

 1916, p. 351, pi. 62, figs. 16-19, pis. 64, 65.— Thiele, 1904, p. 27. 



Carapace elliptical, covering third appendages on female, almost 

 to abdomen of male ; abdomen ovate, broad at top on male, covering 

 base of fourth appendages of both sexes ; anal sinus deep, anal f urcae 

 over halfway from base, tips rounded. The respiratory areas ex- 

 tend only as far forward as the second maxillae. The smaller one 

 is set in a notch in the upper mesial side of the larger with a second 

 notch below it and a widened posterior portion (fig. 44, h). 



Figure 44. — Argulus lepidostei: a, Male accessory organs of last three legs ; 6, respiratory 

 areas ; c, ribs of suction cups. 



First antennae with the lateral hook curved back, the anterior 

 hook and midventral spine present, but no spine at the base. The 

 tip of the flagellum is opposed by a slender branch. A larger spine 

 is located at the base of the second antennae and a very large one 

 near the midline of the body. The basal segments are not very stout. 

 The suctions cups are large and close together; rims supported by ribs 

 made up of a series of eight or nine short rods progressively smaller 



